Hypersonic weapons, by definition, travel five or more times than the speed of sound.
Hypersonic cruise missiles which are powered by scramjet are restricted to less than 100,000 feet.
Hypersonic glide vehicles on the other hand, can travel higher.
In comparison to a ballistic i.e. parabolic trajectory, a hypersonic vehicle is much more agile, hence much more difficult to intercept.
As per the latest intelligence estimates, Russia and China lead in hypersonic weapon development, trailed by the United States. and France.